Subtitles

I’m attempting to download subtitle for a video from my computer not available on any add on. When I click on the audio and subtitles icon and then click on “browse for subtitles” it goes immediately to a folder many levels down in my system. I do not know what folder it is in. It does not give an option to go into my C: drive and navigate from there or give any indication the folder that is in so that I could add a subtitles folder there for access. Can anyone tell me how I can add subtitles that I have on my computer.